hantol
41

So you have fractions here I see. You have $\frac{72}{54}$, meaning there are 72 6th graders to 54 7th graders. Now get the greatest common factor of these numbers to simpify the fraction. $\frac{72}{54}$ and divide both numbers by 18, which is the gcf of 72 and 54. You will get $\frac{4}{3}$ Which is also equal to 1:1.25